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This study investigated the performance characteristics of ten different commercially available
propellers typically seen on auxiliary sailboats. Included in the testing were two feathering propellers,
three folding propellers, one self-pitching propeller, and four fixed-bladed propellers. All propellers
were of the same pitch and diameter. Testing at the MIT Marine Hydrodynamics Laboratory
consisted of three common boating situations: forward boatspeed, forward rotation (normal forward
operation); forward boatspeed, reverse rotation (backing down); and forward boatspeed, no
rotation (drag under sail). It was found that all ten propellers performed generally well in forward
operation, but that large differences in performance existed in reverse and in drag. The text of this
report is written with the lay audience in mind.
